"By deciding to have two architects on the project, the Oratorians created an arrangement destined to fail. And it did" (Morissey 26). 

Borrimini's initial role was to execute Maruscelli's blueprints, Borromini almost instantly proposed alterations. Soon after his appointment with Borromini, Maruscelli resigned from the project, not able to handle Borromini's overbearing persona. Though Oratorio became what is now not by Borromini himself, considering that it was built in large part to Maruscelli's creation. "He had determined where it would stand and how the rooms around it should be arranged. What Borromini added was a greater sense of importance, of seriousness. Right beside the oratory is a church called the Santa Maria or also known as the Chiesa Nuova. Borromini's job was not to  compete with the Chiesa Nuova, but to make the oratory compelling enough to be worthy of residing next to it.